Data/hora: 06/06/2024 01:00:31

Provedor de dados: | 64
País: | Brazil
Título: | Development of rice seedlings grown from pre-hydrated seeds and irradiated with gamma rays
Autores: | Silva,Aline Scheer da; Danielowski,Rodrigo; Braga,Eugenia Jacira Bolacel; Deuner,Sidnei; Magalhães Junior,Ariano Martins de; Peters,Jose Antonio.
Data: | 2011-12-01
Ano: | 2011
Palavras-chave: | Oryza sativa L; Humidity; Genetic variability.
Resumo: | Techniques used to induce mutations, such as ionizing radiation, are an effective tool in increasing genetic variability in breeding programs of species of economic interest. This study aimed to evaluate the effect of different doses of Co60 gamma radiation on previously soaked seeds on the emergence and early growth of seedlings of two rice cultivars. To do this, seeds (25% moisture) of BRS Querência and BRS Fronteira were irradiated with zero (control), 50, 100, 150 and 200 Gy, and then sown in trays containing soil and kept in a greenhouse. The results showed that gamma radiation affected seedling development, where the highest dose tested (200 Gy) significantly reduced the emergence and the index of emergence speed. Growth parameters were reduced greater reduction in cv. BRS Querência. For antioxidant enzymes, superoxide dismutase expressed little variation for the periods evaluated. Already ascorbate peroxidase and catalase showed a significant increase in horsepower cv. BRS Fronteira at 14 DAS, followed by an increase in both cultivars ascorbate peroxidase activity at 28 DAS. The highest antioxidant capacity observed in cv. BRS Fronteira conferred greater tolerance to stress caused by gamma radiation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000600008
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542011000600008
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.35 n.6 2011
Fonte: | info:eu-repo/semantics/openAccess